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Medical Care:
doi: 10.1097/MLR.0b013e31819434c6
Original Article

Recent Improvements in Bariatric Surgery Outcomes

Encinosa, William E. PhD*; Bernard, Didem M. PhD†; Du, Dongyi MS‡; Steiner, Claudia A. MD, MPH*

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Abstract

Objective: Bariatric surgery is one of the fastest growing hospital procedures, but with a 40% complication rate in 2001. Between 2001 and 2005 bariatric surgeries grew by 113%. Our objective is to examine how 6-month complications improved between 2001 and 2006, using a nationwide, population-based sample.

Data/Design: We examined insurance claims in 2001–2002 and 2005–2006 for 9582 bariatric surgeries, at 652 hospitals, among a population of 16 million nonelderly people. Outcomes and costs were risk-adjusted using multivariate regression methods with hospital fixed effects.

Principal Findings: Between 2001 and 2006, while older and sicker patients underwent the surgery, the 180-day risk-adjusted complication rate declined 21% from 41.7% to 32.8%. Most of the improvement was in the initial hospital stay, where the risk-adjusted inpatient complication rate declined 37%, from 23.6% to 14.8%. Risk-adjusted rates of readmissions with complications declined 31%, from 9.8% to 6.8%. Risk-adjusted hospital days declined from 6 to 3.7 days, and risk-adjusted and inflation-adjusted payments declined 6%.

Improvements in complication rates and readmission rates were associated with a within-hospital 30% increase in hospital volume. Volume had no impact on costs. The use of laparoscopy, which increased from 9% to 71%, reduced costs by 12%, while gastric banding decreased costs by 20%. Laparoscopy had no impact on readmissions, but the increase in banding without bypass reduced readmissions.

Conclusions: Improvements in bariatric outcomes and costs were due to a mix of within-hospital volume increases, a move to a laparoscopic technique, and an increase in banding without bypass.

© 2009 Lippincott Williams & Wilkins, Inc.

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